From: "Jason A. Donenfeld" <Jason@zx2c4.com>
To: Herbert Xu <herbert@gondor.apana.org.au>
Cc: LKML <linux-kernel@vger.kernel.org>,
Linux Crypto Mailing List <linux-crypto@vger.kernel.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Emil Renner Berthing <kernel@esmil.dk>,
Ard Biesheuvel <ardb@kernel.org>, stable <stable@vger.kernel.org>
Subject: Re: [PATCH URGENT crypto v2] crypto: arm64/chacha - correctly walk through blocks
Date: Thu, 19 Mar 2020 22:01:58 -0600 [thread overview]
Message-ID: <CAHmME9qYnb10J+jnBhv3TAfjgvoPeY_3kb4-K+nvZir1YrqvgQ@mail.gmail.com> (raw)
In-Reply-To: <20200320034834.GA27372@gondor.apana.org.au>
On Thu, Mar 19, 2020 at 9:48 PM Herbert Xu <herbert@gondor.apana.org.au> wrote:
>
> On Wed, Mar 18, 2020 at 08:27:32PM -0600, Jason A. Donenfeld wrote:
> > Prior, passing in chunks of 2, 3, or 4, followed by any additional
> > chunks would result in the chacha state counter getting out of sync,
> > resulting in incorrect encryption/decryption, which is a pretty nasty
> > crypto vuln: "why do images look weird on webpages?" WireGuard users
> > never experienced this prior, because we have always, out of tree, used
> > a different crypto library, until the recent Frankenzinc addition. This
> > commit fixes the issue by advancing the pointers and state counter by
> > the actual size processed. It also fixes up a bug in the (optional,
> > costly) stride test that prevented it from running on arm64.
> >
> > Fixes: b3aad5bad26a ("crypto: arm64/chacha - expose arm64 ChaCha routine as library function")
> > Reported-and-tested-by: Emil Renner Berthing <kernel@esmil.dk>
> > Cc: Ard Biesheuvel <ardb@kernel.org>
> > Cc: stable@vger.kernel.org # v5.5+
> > Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
> > ---
> > arch/arm64/crypto/chacha-neon-glue.c | 8 ++++----
> > lib/crypto/chacha20poly1305-selftest.c | 11 ++++++++---
> > 2 files changed, 12 insertions(+), 7 deletions(-)
>
> Patch applied. Thanks.
Thanks! No idea whether Linus will skip a 5.6-rc7 with people not at
work due to the quarantines, so given the gravity of this bug, it
might be prudent to send a PR to him _now_, rather then waiting until
next week.
Jason
prev parent reply other threads:[~2020-03-20 4:02 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-18 23:45 [PATCH URGENT crypto] crypto: arm64/chacha - correctly walk through blocks Jason A. Donenfeld
2020-03-19 0:23 ` Eric Biggers
2020-03-19 0:30 ` Eric Biggers
2020-03-19 1:33 ` Jason A. Donenfeld
2020-03-19 2:27 ` [PATCH URGENT crypto v2] " Jason A. Donenfeld
2020-03-19 3:25 ` Eric Biggers
2020-03-19 4:25 ` Jason A. Donenfeld
2020-03-19 4:36 ` Jason A. Donenfeld
2020-03-19 19:03 ` Eric Biggers
2020-03-20 3:48 ` Herbert Xu
2020-03-20 4:01 ` Jason A. Donenfeld [this message]
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